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          <div class="mdui-card-primary-title">Android13源码添加系统服务</div>
          <div class="mdui-card-primary-subtitle"><i class="iconfont">&#xe697;</i> 2023-11-04 / <i class="iconfont">&#xe601;</i> 龙之叶 &nbsp;&nbsp; <span id="busuanzi_container_page_pv" style="display: none;"><i class="iconfont">&#xe7fd;</i> <span id="busuanzi_value_page_pv"></span></span></div>
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      <p>本文基于Android 13的framework层添加系统接口，为应用层提供读写函数、以及执行命令!</p>
<h3 id="添加接口"><a href="#添加接口" class="headerlink" title="添加接口"></a>添加接口</h3><p><strong>frameworks/base/core/java/android/app/IDevices.aidl</strong></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> android.app;</span><br><span class="line"><span class="keyword">interface</span> <span class="title class_">IDevices</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">//读取文件</span></span><br><span class="line">    String <span class="title function_">readFile</span><span class="params">(String path)</span>;</span><br><span class="line">    <span class="comment">//写入文件</span></span><br><span class="line">    <span class="keyword">void</span> <span class="title function_">writeFile</span><span class="params">(String path,String data)</span>;</span><br><span class="line">    <span class="comment">//执行shell命令</span></span><br><span class="line">    String <span class="title function_">shellExec</span><span class="params">(String cmd)</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="添加系统服务的Manager"><a href="#添加系统服务的Manager" class="headerlink" title="添加系统服务的Manager"></a>添加系统服务的Manager</h3><p><strong>frameworks/base/core/java/android/app/DevicesManager.java</strong></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> android.app;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> android.annotation.SystemService;</span><br><span class="line"><span class="keyword">import</span> android.content.Context;</span><br><span class="line"><span class="keyword">import</span> android.os.RemoteException;</span><br><span class="line"><span class="keyword">import</span> android.util.Slog;</span><br><span class="line"></span><br><span class="line"><span class="meta">@SystemService(Context.DEVICES_SERVICE)</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">DevicesManager</span> &#123;</span><br><span class="line">    Context mContext;</span><br><span class="line">    IDevices mService;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="title function_">DevicesManager</span><span class="params">(Context context,IDevices service)</span>&#123;</span><br><span class="line">        <span class="keyword">if</span>(service==<span class="literal">null</span>)&#123;</span><br><span class="line">            Slog.e(<span class="string">&quot;DevicesManager&quot;</span>,<span class="string">&quot;Construct service is null&quot;</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        mContext = context;</span><br><span class="line">        mService = service;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> String <span class="title function_">shellExec</span><span class="params">(String cmd)</span>&#123;</span><br><span class="line">        <span class="keyword">if</span>(mService != <span class="literal">null</span>)&#123;</span><br><span class="line">            <span class="keyword">try</span>&#123;</span><br><span class="line">                Slog.e(<span class="string">&quot;DevicesManager&quot;</span>,<span class="string">&quot;shellExec&quot;</span>);</span><br><span class="line">                <span class="keyword">return</span> mService.shellExec(cmd);</span><br><span class="line">            &#125;<span class="keyword">catch</span>(RemoteException e)&#123;</span><br><span class="line">                Slog.e(<span class="string">&quot;DevicesManager&quot;</span>,<span class="string">&quot;RemoteException &quot;</span>+e);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;<span class="keyword">else</span>&#123;</span><br><span class="line">            Slog.e(<span class="string">&quot;DevicesManager&quot;</span>,<span class="string">&quot;mService is null&quot;</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> <span class="string">&quot;&quot;</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> String <span class="title function_">readFile</span><span class="params">(String path)</span>&#123;</span><br><span class="line">        <span class="keyword">if</span>(mService != <span class="literal">null</span>)&#123;</span><br><span class="line">            <span class="keyword">try</span>&#123;</span><br><span class="line">                Slog.e(<span class="string">&quot;DevicesManager&quot;</span>,<span class="string">&quot;readFile&quot;</span>);</span><br><span class="line">                <span class="keyword">return</span> mService.readFile(path);</span><br><span class="line">            &#125;<span class="keyword">catch</span>(RemoteException e)&#123;</span><br><span class="line">                Slog.e(<span class="string">&quot;DevicesManager&quot;</span>,<span class="string">&quot;RemoteException &quot;</span>+e);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;<span class="keyword">else</span>&#123;</span><br><span class="line">            Slog.e(<span class="string">&quot;DevicesManager&quot;</span>,<span class="string">&quot;mService is null&quot;</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> <span class="string">&quot;&quot;</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">writeFile</span><span class="params">(String path,String data)</span>&#123;</span><br><span class="line">        <span class="keyword">if</span>(mService != <span class="literal">null</span>)&#123;</span><br><span class="line">            <span class="keyword">try</span>&#123;</span><br><span class="line">                Slog.e(<span class="string">&quot;DevicesManager&quot;</span>,<span class="string">&quot;writeFile&quot;</span>);</span><br><span class="line">                mService.writeFile(path,data);</span><br><span class="line">            &#125;<span class="keyword">catch</span>(RemoteException e)&#123;</span><br><span class="line">                Slog.e(<span class="string">&quot;DevicesManager&quot;</span>,<span class="string">&quot;RemoteException &quot;</span>+e);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;<span class="keyword">else</span>&#123;</span><br><span class="line">            Slog.e(<span class="string">&quot;DevicesManager&quot;</span>,<span class="string">&quot;mService is null&quot;</span>);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="添加系统服务，实现aidl文件的接口"><a href="#添加系统服务，实现aidl文件的接口" class="headerlink" title="添加系统服务，实现aidl文件的接口"></a>添加系统服务，实现aidl文件的接口</h3><p><strong>frameworks/base/services/core/java/com/android/server/DevicesService.java</strong></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br><span class="line">133</span><br><span class="line">134</span><br><span class="line">135</span><br><span class="line">136</span><br><span class="line">137</span><br><span class="line">138</span><br><span class="line">139</span><br><span class="line">140</span><br><span class="line">141</span><br><span class="line">142</span><br><span class="line">143</span><br><span class="line">144</span><br><span class="line">145</span><br><span class="line">146</span><br><span class="line">147</span><br><span class="line">148</span><br><span class="line">149</span><br><span class="line">150</span><br><span class="line">151</span><br><span class="line">152</span><br><span class="line">153</span><br><span class="line">154</span><br><span class="line">155</span><br><span class="line">156</span><br><span class="line">157</span><br><span class="line">158</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.android.server; </span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> android.app.IDevices;</span><br><span class="line"><span class="keyword">import</span> android.content.Context;</span><br><span class="line"><span class="keyword">import</span> android.os.Build;</span><br><span class="line"><span class="keyword">import</span> android.util.Log;</span><br><span class="line"><span class="keyword">import</span> android.util.Slog;</span><br><span class="line"> </span><br><span class="line"><span class="keyword">import</span> java.io.File;</span><br><span class="line"><span class="keyword">import</span> java.io.FileInputStream;</span><br><span class="line"><span class="keyword">import</span> java.io.FileOutputStream;</span><br><span class="line"><span class="keyword">import</span> java.io.IOException;</span><br><span class="line"> </span><br><span class="line"><span class="keyword">import</span> libcore.io.IoUtils;</span><br><span class="line"> </span><br><span class="line"><span class="keyword">import</span> java.io.BufferedReader;</span><br><span class="line"><span class="keyword">import</span> java.io.InputStream;</span><br><span class="line"><span class="keyword">import</span> java.io.InputStreamReader;</span><br><span class="line"><span class="keyword">import</span> java.io.OutputStream;</span><br><span class="line"><span class="keyword">import</span> java.io.RandomAccessFile;</span><br><span class="line"> </span><br><span class="line"><span class="keyword">import</span> android.util.Base64;</span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">DevicesService</span> <span class="keyword">extends</span> <span class="title class_">IDevices</span>.Stub &#123;</span><br><span class="line">    <span class="keyword">private</span> Context mContext;</span><br><span class="line">    <span class="keyword">private</span> String TAG=<span class="string">&quot;DevicesService&quot;</span>;</span><br><span class="line">    <span class="keyword">public</span> <span class="title function_">DevicesService</span><span class="params">(Context context)</span>&#123;</span><br><span class="line">        <span class="built_in">super</span>();</span><br><span class="line">        mContext = context;</span><br><span class="line">        Slog.d(TAG,<span class="string">&quot;Construct&quot;</span>);</span><br><span class="line">    &#125;</span><br><span class="line"> </span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="keyword">public</span> String <span class="title function_">shellExec</span><span class="params">(String cmd)</span>&#123;</span><br><span class="line">        <span class="type">Runtime</span> <span class="variable">mRuntime</span> <span class="operator">=</span> Runtime.getRuntime();</span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            <span class="comment">//Process中封装了返回的结果和执行错误的结果</span></span><br><span class="line">            Slog.d(TAG,<span class="string">&quot;shellExec data:&quot;</span>+cmd);</span><br><span class="line">            <span class="type">Process</span> <span class="variable">mProcess</span> <span class="operator">=</span> mRuntime.exec(cmd);</span><br><span class="line">            <span class="type">BufferedReader</span> <span class="variable">mReader</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">BufferedReader</span>(<span class="keyword">new</span> <span class="title class_">InputStreamReader</span>(mProcess.getInputStream()));</span><br><span class="line">            <span class="type">StringBuffer</span> <span class="variable">mRespBuff</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">StringBuffer</span>();</span><br><span class="line">            <span class="type">char</span>[] buff = <span class="keyword">new</span> <span class="title class_">char</span>[<span class="number">1024</span>];</span><br><span class="line">            <span class="type">int</span> <span class="variable">ch</span> <span class="operator">=</span> <span class="number">0</span>;</span><br><span class="line">            <span class="keyword">while</span> ((ch = mReader.read(buff)) != -<span class="number">1</span>) &#123;</span><br><span class="line">                mRespBuff.append(buff, <span class="number">0</span>, ch);</span><br><span class="line">            &#125;</span><br><span class="line">            mReader.close();</span><br><span class="line">            <span class="keyword">return</span> mRespBuff.toString();</span><br><span class="line">        &#125; <span class="keyword">catch</span> (IOException e) &#123;</span><br><span class="line">            <span class="comment">// TODO Auto-generated catch block</span></span><br><span class="line">            e.printStackTrace();</span><br><span class="line">            Slog.d(TAG,<span class="string">&quot;shellExec err:&quot;</span>+e.getMessage());</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> <span class="string">&quot;&quot;</span>;</span><br><span class="line">    &#125;</span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title function_">writeTxtToFile</span><span class="params">(String strcontent, String filePath)</span> &#123;</span><br><span class="line">        <span class="type">String</span> <span class="variable">strFilePath</span> <span class="operator">=</span> filePath;</span><br><span class="line">        <span class="type">String</span> <span class="variable">strContent</span> <span class="operator">=</span> strcontent + <span class="string">&quot;\n&quot;</span>;  <span class="comment">// \r\n 结尾会变成 ^M</span></span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            <span class="type">File</span> <span class="variable">file</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">File</span>(strFilePath);</span><br><span class="line">            makeFilePath(file.getParent(),file.getName());</span><br><span class="line">            <span class="keyword">if</span> (!file.exists()) &#123;</span><br><span class="line">                file.getParentFile().mkdirs();</span><br><span class="line">                file.createNewFile();</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="type">RandomAccessFile</span> <span class="variable">raf</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">RandomAccessFile</span>(file, <span class="string">&quot;rwd&quot;</span>);</span><br><span class="line">            raf.setLength(<span class="number">0</span>);</span><br><span class="line"> </span><br><span class="line">            <span class="comment">// 写文件的位置标记,从文件开头开始,后续读取文件内容从该标记开始</span></span><br><span class="line">            <span class="type">long</span> <span class="variable">writePosition</span> <span class="operator">=</span> raf.getFilePointer();</span><br><span class="line">            raf.seek(writePosition);</span><br><span class="line">            raf.write(strContent.getBytes());</span><br><span class="line">            raf.close();</span><br><span class="line">            <span class="comment">//</span></span><br><span class="line">        &#125; <span class="keyword">catch</span> (Exception e) &#123;</span><br><span class="line">            Log.d(<span class="string">&quot;DevicesService&quot;</span>,<span class="string">&quot;Error on write File:&quot;</span> + e);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"> </span><br><span class="line">    <span class="comment">// 生成文件</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> File <span class="title function_">makeFilePath</span><span class="params">(String filePath, String fileName)</span> &#123;</span><br><span class="line">        <span class="type">File</span> <span class="variable">file</span> <span class="operator">=</span> <span class="literal">null</span>;</span><br><span class="line">        makeRootDirectory(filePath);</span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            file = <span class="keyword">new</span> <span class="title class_">File</span>(filePath +<span class="string">&quot;/&quot;</span>+ fileName);</span><br><span class="line">            <span class="keyword">if</span> (!file.exists()) &#123;</span><br><span class="line">                file.createNewFile();</span><br><span class="line">            &#125;</span><br><span class="line">        &#125; <span class="keyword">catch</span> (Exception e) &#123;</span><br><span class="line">            e.printStackTrace();</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> file;</span><br><span class="line">    &#125;</span><br><span class="line"> </span><br><span class="line">    <span class="comment">// 生成文件夹</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title function_">makeRootDirectory</span><span class="params">(String filePath)</span> &#123;</span><br><span class="line">        <span class="type">File</span> <span class="variable">file</span> <span class="operator">=</span> <span class="literal">null</span>;</span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            Log.d(<span class="string">&quot;FileHelper&quot;</span>, <span class="string">&quot;makeRootDirectory &quot;</span>+filePath);</span><br><span class="line">            file = <span class="keyword">new</span> <span class="title class_">File</span>(filePath);</span><br><span class="line">            <span class="keyword">if</span> (!file.exists()) &#123;</span><br><span class="line">                <span class="type">boolean</span> isok= file.mkdir();</span><br><span class="line">                Log.d(<span class="string">&quot;FileHelper&quot;</span>, <span class="string">&quot;makeRootDirectory &quot;</span>+filePath+<span class="string">&quot; &quot;</span>+isok);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125; <span class="keyword">catch</span> (Exception e) &#123;</span><br><span class="line">            Log.d(<span class="string">&quot;DevicesService&quot;</span>, e+<span class="string">&quot;&quot;</span>);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"> </span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> String <span class="title function_">readFileAll</span><span class="params">(String path)</span> &#123;</span><br><span class="line">        <span class="type">File</span> <span class="variable">file</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">File</span>(path);</span><br><span class="line">        StringBuilder sb=<span class="keyword">new</span> <span class="title class_">StringBuilder</span>();</span><br><span class="line">        <span class="keyword">if</span> (file != <span class="literal">null</span> &amp;&amp; file.exists()) &#123;</span><br><span class="line">            <span class="type">InputStream</span> <span class="variable">inputStream</span> <span class="operator">=</span> <span class="literal">null</span>;</span><br><span class="line">            <span class="type">BufferedReader</span> <span class="variable">bufferedReader</span> <span class="operator">=</span> <span class="literal">null</span>;</span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                inputStream = <span class="keyword">new</span> <span class="title class_">FileInputStream</span>(file);</span><br><span class="line">                bufferedReader = <span class="keyword">new</span> <span class="title class_">BufferedReader</span>(<span class="keyword">new</span> <span class="title class_">InputStreamReader</span>(</span><br><span class="line">                        inputStream));</span><br><span class="line">                String outData;</span><br><span class="line">                <span class="keyword">while</span>((outData=bufferedReader.readLine())!=<span class="literal">null</span>)&#123;</span><br><span class="line">                    sb.append(outData+<span class="string">&quot;\n&quot;</span>);</span><br><span class="line">                &#125;</span><br><span class="line">            &#125; <span class="keyword">catch</span> (Throwable t) &#123;</span><br><span class="line">            &#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">                <span class="keyword">try</span> &#123;</span><br><span class="line">                    <span class="keyword">if</span> (bufferedReader != <span class="literal">null</span>) &#123;</span><br><span class="line">                        bufferedReader.close();</span><br><span class="line">                    &#125;</span><br><span class="line">                &#125; <span class="keyword">catch</span> (Exception e) &#123;</span><br><span class="line">                    e.printStackTrace();</span><br><span class="line">                &#125;</span><br><span class="line">                <span class="keyword">try</span> &#123;</span><br><span class="line">                    <span class="keyword">if</span> (inputStream != <span class="literal">null</span>) &#123;</span><br><span class="line">                        inputStream.close();</span><br><span class="line">                    &#125;</span><br><span class="line">                &#125; <span class="keyword">catch</span> (Exception e) &#123;</span><br><span class="line">                    e.printStackTrace();</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> sb.toString();</span><br><span class="line">    &#125;</span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="keyword">public</span> String <span class="title function_">readFile</span><span class="params">(String path)</span>&#123;</span><br><span class="line">        <span class="keyword">return</span> readFileAll(path);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">writeFile</span><span class="params">(String path,String data)</span>&#123;</span><br><span class="line">        writeTxtToFile(data,path);</span><br><span class="line">    &#125;</span><br><span class="line"> </span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="添加服务名称"><a href="#添加服务名称" class="headerlink" title="添加服务名称"></a>添加服务名称</h3><p><strong>frameworks/base/core/java/android/content/Context.java</strong></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">        <span class="meta">@StringDef(suffix = &#123; &quot;_SERVICE&quot; &#125;, value = &#123;</span></span><br><span class="line"><span class="meta">                POWER_SERVICE,</span></span><br><span class="line"><span class="meta">/*add_longzhiye*/++    DEVICES_SERVICE,</span></span><br><span class="line"><span class="meta">                //@hide: POWER_STATS_SERVICE,</span></span><br><span class="line"><span class="meta">                WINDOW_SERVICE,</span></span><br><span class="line"><span class="meta">                LAYOUT_INFLATER_SERVICE,</span></span><br><span class="line"><span class="meta">                ACCOUNT_SERVICE,</span></span><br><span class="line"><span class="meta">                ACTIVITY_SERVICE,</span></span><br><span class="line"><span class="meta">                ALARM_SERVICE,</span></span><br><span class="line"><span class="meta"> </span></span><br><span class="line"><span class="meta"> </span></span><br><span class="line"><span class="meta"> </span></span><br><span class="line"><span class="meta">  public static final String POWER_SERVICE = &quot;power&quot;;</span></span><br><span class="line"><span class="meta">++public static final String DEVICES_SERVICE = &quot;devices&quot;;</span></span><br></pre></td></tr></table></figure>

<h3 id="将实现的服务注册到系统中去"><a href="#将实现的服务注册到系统中去" class="headerlink" title="将实现的服务注册到系统中去"></a>将实现的服务注册到系统中去</h3><p><strong>frameworks/base/core/java/android/app/SystemServiceRegistry.java</strong></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line">registerService(Context.SEARCH_SERVICE, SearchManager.class,</span><br><span class="line">        <span class="keyword">new</span> <span class="title class_">CachedServiceFetcher</span>&lt;SearchManager&gt;() &#123;</span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="keyword">public</span> SearchManager <span class="title function_">createService</span><span class="params">(ContextImpl ctx)</span> <span class="keyword">throws</span> ServiceNotFoundException &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> <span class="title class_">SearchManager</span>(ctx.getOuterContext(),</span><br><span class="line">                ctx.mMainThread.getHandler());</span><br><span class="line">    &#125;&#125;);</span><br><span class="line"><span class="comment">//add longzhiye</span></span><br><span class="line">registerService(Context.DEVICES_SERVICE,DevicesManager.class,</span><br><span class="line">        <span class="keyword">new</span> <span class="title class_">CachedServiceFetcher</span>&lt;DevicesManager&gt;()&#123;</span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="keyword">public</span> DevicesManager <span class="title function_">createService</span><span class="params">(ContextImpl ctx)</span>&#123;</span><br><span class="line">        <span class="type">IBinder</span> <span class="variable">b</span> <span class="operator">=</span> ServiceManager.getService(Context.DEVICES_SERVICE);</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> <span class="title class_">DevicesManager</span>(ctx,IDevices.Stub.asInterface(b));</span><br><span class="line">                &#125; &#125;);   </span><br><span class="line"><span class="comment">//add end       </span></span><br><span class="line">registerService(Context.SENSOR_SERVICE, SensorManager.class,</span><br><span class="line">        <span class="keyword">new</span> <span class="title class_">CachedServiceFetcher</span>&lt;SensorManager&gt;() &#123;</span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="keyword">public</span> SensorManager <span class="title function_">createService</span><span class="params">(ContextImpl ctx)</span> &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> <span class="title class_">SystemSensorManager</span>(ctx.getOuterContext(),</span><br><span class="line">          ctx.mMainThread.getHandler().getLooper());</span><br><span class="line">    &#125;&#125;);</span><br></pre></td></tr></table></figure>

<h3 id="将注册的服务设置成开机启动服务"><a href="#将注册的服务设置成开机启动服务" class="headerlink" title="将注册的服务设置成开机启动服务"></a>将注册的服务设置成开机启动服务</h3><p><strong>frameworks/base/services/java/com/android/server/SystemServer.java</strong></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">t.traceBegin(<span class="string">&quot;StartTelephonyRegistry&quot;</span>);</span><br><span class="line">telephonyRegistry = <span class="keyword">new</span> <span class="title class_">TelephonyRegistry</span>(</span><br><span class="line">        context, <span class="keyword">new</span> <span class="title class_">TelephonyRegistry</span>.ConfigurationProvider());</span><br><span class="line">ServiceManager.addService(<span class="string">&quot;telephony.registry&quot;</span>, telephonyRegistry);</span><br><span class="line">t.traceEnd();</span><br><span class="line"><span class="comment">//add longzhiye</span></span><br><span class="line">t.traceBegin(<span class="string">&quot;StartDevicesService&quot;</span>);</span><br><span class="line"><span class="keyword">try</span>&#123;</span><br><span class="line">    ServiceManager.addService(Context.DEVICES_SERVICE,<span class="keyword">new</span> <span class="title class_">DevicesService</span>(context));</span><br><span class="line">&#125; <span class="keyword">catch</span>(Throwable e)&#123;</span><br><span class="line">    Slog.e(<span class="string">&quot;DevicesService&quot;</span>,<span class="string">&quot;Failed to start DevicesService Service &quot;</span>+e);</span><br><span class="line">&#125;</span><br><span class="line">t.traceEnd();</span><br><span class="line"><span class="comment">//add end</span></span><br></pre></td></tr></table></figure>

<h3 id="让lint检查忽略掉自己的模块"><a href="#让lint检查忽略掉自己的模块" class="headerlink" title="让lint检查忽略掉自己的模块"></a>让lint检查忽略掉自己的模块</h3><p>注(Android 11 以后谷歌强制开启lint检查，lint检查不过编译会报错)</p>
<p><strong>frameworks/base/Android.bp</strong></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// TODO(b/145644363): move this to under StubLibraries.bp or ApiDocs.bp</span></span><br><span class="line">metalava_framework_docs_args = <span class="string">&quot;&quot;</span> +</span><br><span class="line">    <span class="string">&quot;--api-lint-ignore-prefix android.app. &quot;</span> +     <span class="comment">//add_longzhiye</span></span><br><span class="line">    <span class="string">&quot;--api-lint-ignore-prefix android.icu. &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--api-lint-ignore-prefix java. &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--api-lint-ignore-prefix junit. &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--api-lint-ignore-prefix org. &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--error NoSettingsProvider &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--error UnhiddenSystemApi &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--force-convert-to-warning-nullability-annotations +*:-android.*:+android.icu.*:-dalvik.* &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--hide BroadcastBehavior &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--hide CallbackInterface &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--hide DeprecationMismatch &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--hide HiddenSuperclass &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--hide HiddenTypeParameter &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--hide MissingPermission &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--hide-package android.audio.policy.configuration.V7_0 &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--hide-package com.android.server &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--hide RequiresPermission &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--hide SdkConstant &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--hide Todo &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--hide Typo &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--hide UnavailableSymbol &quot;</span> +</span><br><span class="line">    <span class="string">&quot;--manifest $(location core/res/AndroidManifest.xml) &quot;</span></span><br></pre></td></tr></table></figure>

<h3 id="编译源码-更新api接口"><a href="#编译源码-更新api接口" class="headerlink" title="编译源码 更新api接口"></a>编译源码 更新api接口</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">make update-api</span><br></pre></td></tr></table></figure>

<h3 id="检查服务是否开启"><a href="#检查服务是否开启" class="headerlink" title="检查服务是否开启"></a>检查服务是否开启</h3><p>将编译好的rom 刷入手机,查看sevice list<br>这里可以看到我们的服务 已经启动了：<br>服务名称：79 devices: [android.app.IDevices]</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">longzhiye@longzhiye-laptop:~$ adb shell</span><br><span class="line">coral:/ <span class="comment"># service list |grep Device</span></span><br><span class="line">60    companiondevice: [android.companion.ICompanionDeviceManager]</span><br><span class="line">75    device_identifiers: [android.os.IDeviceIdentifiersPolicyService]</span><br><span class="line">76    device_policy: [android.app.admin.IDevicePolicyManager]</span><br><span class="line">77    device_state: [android.hardware.devicestate.IDeviceStateManager]</span><br><span class="line">78    deviceidle: [android.os.IDeviceIdleController]</span><br><span class="line">79    devices: [android.app.IDevices]</span><br><span class="line">251    virtualdevice: [android.companion.virtual.IVirtualDeviceManager]</span><br><span class="line">coral:/ <span class="comment">#</span></span><br></pre></td></tr></table></figure>

<h3 id="调用测试"><a href="#调用测试" class="headerlink" title="调用测试"></a>调用测试</h3><p>应用层项目中引入aidl</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// IDevices.aidl</span></span><br><span class="line"><span class="keyword">package</span> android.app;</span><br><span class="line"> </span><br><span class="line"><span class="comment">// Declare any non-default types here with import statements</span></span><br><span class="line"> </span><br><span class="line"><span class="keyword">interface</span> <span class="title class_">IDevices</span> &#123;</span><br><span class="line">        String <span class="title function_">shellExec</span><span class="params">(String cmd)</span>;</span><br><span class="line">        String <span class="title function_">readFile</span><span class="params">(String path)</span>;</span><br><span class="line">        <span class="keyword">void</span> <span class="title function_">writeFile</span><span class="params">(String path,String data)</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p><img src="/images/20231104/20231104001.jpg"><br>调用测试：<br><img src="/images/20231104/20231104002.jpg"></p>

      
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